Limekiln



provlsion of Patented June 9, 1931 UNIITE STAT-ES PATENT oFFic LIMEKILN Application filed July 9, 1927. Serial No. 204,552.

This invention relates to lime kilns.

An object of the invention is the provision of a device in which a chamber is employed containing water in close association with the cooler for burned lime whereby the water takes up the heat of the lime for creating a vapor, which is then discharged into the kiln adjacent the fire box.

A further object of the invention is the a means for burning lime in a shaft lime kiln in which the heat of the burned lime, which is ordinarily wasted in the cooler between draws, is utilized for creating vapor which is injected under its own pressure into the fire box of the kiln.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless itis to be understood that the 1nvention is not confined to the disclosure, being susceptible of such changes and modifications which shall define no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings Figure 1 is a section of the kiln taken along the line 11 of Figure 2 with the fire box removed.

Figure 2 is a vertical section taken along the line 22 of Figure 1;

Figure 3 is a modified form of the kiln and humidifier, and

Figure 4 is a fragmentary section of the cooler and a supporting plate showing Water jackets attached thereto.

Referring more particularly to the drawings 1O designates a foundation of the usual type having a passage 11 therethrough for the movement of a car, which is adapted to be placed below a truncated cooler 12 to receive the lime which is discharged from the shaft lime kiln generally designated by the numeral 13.

The kiln consists of an outer metal shell 14, having an inner liner 15 of common brick and a second liner of fire-resistant material in the form of bricks and designated by the numeral 16. The central core of the kiln, which is immediately surrounded or enclosed by the brick wall 16, forms a stackand includes the fire box for burning the lime.-

A plate 18'f0rmed of metal is located between the lowerend of the shell 14 and a shell 19, which extends from the plate 18- to the foundation or base of the kiln. A second metal shell 20 is disposed concentrically with respect to the shell 19 and forms the inner wall of the discharge chamber. A collar 22 is formed integrally with the ring 18 and embraces the adjacent ends of the shells 14 and 19. Y

The plate 18 has a central passage 23 at the periphery of which the ring is enlarged, asshown at 24. To the enlarged portion of the plate the truncated discharge member and cooler 12 is attached by riveting or bolting.

pair of circular casings 25 and 26' as shown in Fig.2, are secured at diametrically opposite points to the outer face and at the upper end of the cooler 12. These casings are curved to conform to the curvature of the shell 20 and inclined at their inner face as shown at 27 to conform to the inclination of the side walls of the member 12.- A circular flange 28 is formed integrally with the front wall 27 and is welded or secured in any approved manner to the enlargement 24 of the plate 18. The inner'walls 27 of the cas-- ings 25, 26 are secured in any approved manner to the outer face of the discharge member 12. The upper end of each outer wall 29 is secured to the ring, as is a curved rib 30. This construction provides for an evaporating chamber 31 in each of the casings 25 and 2 The casings are supplied with water from a pipe 33, which enters one of the casings at a predetermined height from the bottom 34' of'the casing. The casings are connected together by means of pipe 35 so that the casings are in communication with each other. Any-approved means may be employed for automatically maintaining the water at a predetermined level in said casmgs.

A'pai-r of-pipes 35a and 36 are, respectively connected to transverse 'pipes 37 and 38-by means. of the usual connections. .39 and arein which the steel acts also connected to the casing 25. By means of a connection 39a a pair of pipes 40 and 11 respectively connect transverse pipes 37a and 38a with the casing 26. The pipes 37a and 38a conduct vapors or steam from the chambers 31 of the casings 25 and 26 to points directly under the grates of the kiln for lengthening the flame.

Referring more particularly to Figure 3, a modified form of the casing; is shown. in which a pair of arcuately shaped members 15 and 46 are bent to conform to the curvature of the truncated cooler 12 and have a horizontal portion 17 provided, with a flange 48 which is secured to the outer wall of the conicallv shaped member 12. The upper ends of the curved side walls of the members 45' and 1-6 are secured by means of curved cleats 49 which may be welded or secured in any approved manner to the plate 18.

The operation of my device is as follows:

The kiln is filled with the usual materials for burning lime after the combustion materials have been placed in the bottom of the kiln on the grate 50 or in the fire box. As the combustion eases pass upwardly through the stack of the kiln and the lime is burned,

the burned lime is discharged periodicall intothe truncated member 12 and retained there a. suflicient length of time to cool. in order that it may be dischar ed into the usual cars and carried away. However, the hot lime heats the walls of the member 12 and the water in the chambers 31 or in the chambers 51 is heated and converted into steam. This steam is then conducted by the pipes 37. 38, 37a and 38a. tothe kiln for len thening the flame. It will be appreciated that this particular method employs the heat of the lime which is being discharged from the kiln and which has filled the truncated member 12.

The casings or jackets 25 and 26 in Figure 2 are made of cast iron and are soconstructed that they conform to the upper part of the cooler 12.

The casings or jackets 45 and 46 of Figure 3 are also made of cast iron but the inner walls of the chambers are of steel. said inner walls forming a portion of the steel cooler 12. and as a radiator for the transfer of heat from the burned lime to the water in the chambers 31. and 51.

It will be noted that by my improved process the lime is cooled more rapidly since a greater quantity of heat is employed in prokiln, a water jacket formed of metal and secured to the cooler adjacent the combustion furnace of the kiln, means for supplying the jacket with water, and means for conducting the steam from the jackets to the combustion furnace.

2. A device of the character described comprising a kiln having a combustion furnace a cooler to receive burned lime from the kiln, a metal disc carried by the kiln and having its inner edge connected to the cooler, arouate members L-shaped in cross section connected to the cooler and to the disc to provide spaced water jackets, means for supplying water to the jackets and pipes connected with the jackets and with the combustion chamber for supplying steam from the jack- .ets to the combustion chamber.

WILLIAM J. KUNTZ.

ducing the vapor 1n the chambers so that the lime which has been withdrawn may be more quickly handled'because of the cooling process which is effected by the vaporization of 

